Mental and physical torture by parents

I have been tortured since childhood as my parents gave birth to me to give me to my moms sister who dint have kids, my grandfather's family thought i was lucky for them so they dint let this happen, my sister has always been jealous of me being loved by my whole extended family so she has always been brainwashing my parents to find pleasure my districting my life ,career,etc. Since a yr n half i am getting treated my a psychiatrist for the same reason n my mom n sis know abt it but none of the extended family does as my parents r afraid if i open my mouth abt them, their respect will b hampered, they have been constantly telling me to comit suicide as then they won't hv to explain to my family abt y i died and beat me up of i say i want to move out My father has beaten me many times ,with pair of scissors satung i will murder u, saying i willl burn your face by throwing hot tea, with cricket bat saying i will break your head etc I need legal advice as i constantly feel unsafe